RV-8523 Datasheet, PDF (46/57 Pages) MICORO CRYSTAL SWITZERLAND – Real Time Clock

Micro Crystal
Real Time Clock / Calendar Module
RV-8523
11.2.2. READ MODE AT SPECIFIC ADDRESS
Master reads data after setting Word Address:
1) Master sends out the “Start Condition”.
2) Master sends out the “Slave Address”, D0h for the RV-8523; the R/ W bit in write mode.
3) Acknowledgement from the RV-8523.
4) Master sends out the “Word Address” to the RV-8523.
5) Acknowledgement from the RV-8523.
6) Master sends out the “Re-Start Condition” (“Stop Condition” followed by “Start Condition”)
7) Master sends out the “Slave Address”, D1h for the RV-8523; the R/ W bit in read mode.
8) Acknowledgement from the RV-8523.
At this point, the Master becomes a Receiver, the Slave becomes the Transmitter.
9) The Slave sends out the “data” from the Word Address specified in step 4).
10) Acknowledgement from the Master.
11) Steps 9) and 10) can be repeated if necessary.
The address will be incremented automatically in the RV-8523.
12) The Master, addressed as Receiver, can stop data transmission by not generating an acknowledge on the
last byte that has been sent from the Slave-Transmitter. In this event, the Slave-Transmitter must leave the
data line HIGH to enable the Master to generate a stop condition.
13) Master sends out the “Stop Condition”.
11.2.3. READ MODE
Master reads Slave-Transmitter immediately after first byte:
1) Master sends out the “Start Condition”.
2) Master sends out the “Slave Address”, D1h for the RV-8523; the R/ W bit in read mode.
3) Acknowledgement from the RV-8523.
At this point, the Master becomes a Receiver, the Slave becomes the Transmitter
4) The RV-8523 sends out the “data” from the last accessed Word Address incremented by 1.
5) Acknowledgement from the Master.
6) Steps 4) and 5) can be repeated if necessary.
The address will be incremented automatically in the RV-8523.
7) The Master, addressed as Receiver, can stop data transmission by not generating an acknowledge on the
last byte that has been sent from the Slave-Transmitter. In this event, the Slave-Transmitter must leave the
data line HIGH to enable the Master to generate a stop condition.
8) Master sends out the “Stop Condition”.
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